Developed by Compaq, Hewlett-Packard, Intel, Lucent, Microsoft, NEC and Phillips.
USB Host = The computer, only one host per USB system.
USB Device = A hub or a Function.
Bus-powered hubs: Draw Max 100 mA at power up
and 500 mA normally.
Self-powered hubs: Draw Max 100 mA, must supply
500 mA to each port.
Low power, bus-powered functions: Draw Max 100
mA.
High power, bus-powered functions: Self-powered
hubs: Draw Max 100 mA, must supply 500 mA to each port.
Self-powered functions: Draw Max 100 mA.
Suspended device: Max 0.5 mA
Shield should only be connected to Ground at the host. No device should connect Shield to Ground.
Shielded:
Data: 28 AWG twisted
Power: 28 AWG - 20 AWG non-twisted
Non-shielded:
Data: 28 AWG non-twisted
Power: 28 AWG - 20 AWG non-twisted
| Power Gauge | Max length | 
|---|---|
| 28 | 0.81 m | 
| 26 | 1.31 m | 
| 24 | 2.08 m | 
| 22 | 3.33 m | 
| 20 | 5.00 m | 
| Pin | Name | Cable color | Description | 
|---|---|---|---|
| 1 | VBUS | Red | +5 VDC | 
| 2 | D- | White | Data - | 
| 3 | D+ | Green | Data + | 
| 4 | GND | Black | Ground | 
| Contributor: | Joakim Ögren | 
| Source: | USB FAQ at USB Implementers Forum | 
| USB Specification v2.0 at USB Implementers Forum | 
  Copyright © The Hardware Book Team 1996-2004.
  May be copied and redistributed, partially or in whole, as appropriate.
  Document last modified: 2002-01-10